Improvement in elevating-block



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WILLIAM H. HAWLEY, OF UTICA, NEW YORK. Lettere Patent No. 68,193, datedlAugust 27, 1867.

IMPROVEMENT IN ELBVATING-BLOGK.

TO ALL WHOM ITl MAY CONCERN Be it known that I, WILLIAM H. HAWLEY, of Utica, Oneida county, New York, have v,invented a new and useful Improvement in Elevatinglocks; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a partof this specication, in which- Figure 1 represents a front view of the invention. u i

Figure 2,2. sectional view of the draught-pulley.

Figure 3, a perspective view of a part thereof, chain and stop.

A is 4the case; Al and A2 eyes therein; As 1s a shoulder against which the track-rope may be pressed by .the stop F; B and B are traversing` pulleys; C is the track-rope; D the draught-pulley; D1 Dl D1 D1 are notches in 4the periphery thereof; D2 D2 arc elliptical depressions in the face pf the pulley; D3 is agroove through theccntre ofthe pulley; D* are the shoulders between the elliptical depressions; Eis the draught chain; F is a stop; F1 is a point therein; Fz is a lever-arm therein; F3, a pulley iu such arm; G is also a stop;

H is a cord for operating F; I is a pulley on which it turns; K isa cord for depressing the track-rope at any f given point. y

The present invention is in the nature of an improvement upon the elevating-block for which I have applied for a patent, and consists in adapting the draught-pulley to a chain, and in the arrangement of the parts'so that the chain and pulley must move together, and both may be stopped, not by pressing on the rope or chain; as in my first invention,` but by dropping the stop G into the notches D in the periphery of the pulley D, which will holdthe pulley, and the pulley, from its construction, will hold the chain. All the parts are similar in form and construction and mode of operation to my said first invention, except as to be mentioned, and such.

parts need not, therefore, be again described. The draught-pulley D, instead of being a plain grooved pulley, as in my first-invention, has elliptical depressions in the periphery, so arranged and at such distances apart as that every other link of the chain will fill one of such depressions while lying on its side, while through the centre of the periphery of the pulley is a deeper groove, D, which allows the intermediate links to rest therein edgewise between the shoulders D4, as seen in fig. 3. The edges of the pulley have also notches, D1 Dl Dl D, into which the stop G will fall when it is not pressed upon bythe stop F, which stop G is made hollow, or has "its under side grooved out, so that the chain may pass freely.

The mode of operation is as follows: When a load is to be elevated the cord H is drawn, and the apparatus is held by the stop F to the track-rope C, when, by drawing on the chain E, the links, one after another, fall into their corresponding places on the fall of the pulley D, and when the load has reached the proper height the slacking of the cord H allows the stop G to fall `down on D and catch in the notchesD. This prevents the pulley D from turning backwards, while the links of the chain lying flat in the elliptical depressions of the pulley, are held fast by the pulley, and thus the load is kept suspended.

The advantage of this improvement is that it allows the load to he held up by simply catching the stop G in the notches Dl on the pulley, instead of pressing the rope or chain or strap against the'pulley, as in my rst invention. It may thus be operated more readily and certainly, and with less pressure. The draught-chain may only bethe length required to raise the load; a rope may be attached to the other end.

Having thus described my invention, what I claim therein as new, and desire to secure by Letters Patent, is- The pulley D, substantially as described, in combination with the chain E and stop G, for the uses and purposes mentioned. I

WM. H. HAWLEY.

Witnesses:

GEO. M. WEAVER, JonN G. Cnocxnn. 

